Insulation of windings in electrical apparatus.



G. HONOLD. XESULATIONOF WHIDINGS IN ELE TRIGAL' APPARATUS. AEPLIOATIGN FILED 001218, 1909.

1 79}, Patented Dec. 12, 1911.

W iTN ES 555 UNITED STATES PATENT caries.

GOITLOB HONOLD, OF 'STUTTGABT, GERMANY, ASSIGNDR TO THE FIRM OF ROBERT BOSCH, 0F STUTTGART, GERMANY.

INSULATION OF WINDINGS IN ELECTRICAL APPARATUS.

To all whom it may concern:

Be it known that I, Go'rrLon HONOLD, engineer, a subject of the German Emperor, residing at 11-13 Hoppenlanstrasse, Stuttgart, Germany, have invented certain new and useful Improvements in the Insulation of indings in Electrical Apparatus; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to the insulation of windings in electrical apparatus, more especially. those which have to carry high tension current and are used in the armatures of magneto-ignition ap aratus or in spark inductors. The several ayers of such coils have been provided with double layers of insulation extending to the middle alternately, in order to protect from perforation those windings which have a greater p6 tential difference than the adjacent layer. Furthermore, for the same purpose the separate layers have been subdivided into several sections separated from each other by layers of insulation; thus, after winding one section, a strip of insulating material of the whole width of the bobbin is wound, and the next section is then wound. In this case smooth layers alternate regularly'with the sectional layers so that in separating the sectional layers into two sections there were at the most two layers of insulation, with three sections, three layers and so on; in general, with 11 sections it layers.

In the accompanying drawings showing several modifications in accordance with my invention, Figure 1 is a half section of an insulated winding applied, for example, to the armature core of a magnetoelectric ma chine; Figs. 2 and 3 show modifications of the winding of Fig. l; and Fig. 4 is an end view, partly broken away, of Fig. 1; as will be described more fully hereinafter.

The layers a of the winding are separated by flat insulating strips 6. The otherinsulating strips consist of flat portions (2' connected by upstanding portions 0 which subdivide each layer into sections as shown. In this way each layer is subdivided into sections in such manner that the sub- Speclli'oation. of Letters Patent. Patented Dec, 12, 1911. Application filed October 18, 1909. Serial No. 523,326.

divisions of any one layer progressively rise in a direction opposite to that of adjacent layers.

' The invention consists in subdividing each layer of the winding into sections and separating these by layers separated from each other by layers of insulating material in such a manner that, as in Fig. l of the accompanying drawings, with two sections there are three at the point where the potential difierence between the windings of two neighboring layers is greatest, and successively two layers of insulating material and one where the otential difference does not call for more. 6r else as in Fig. 2, with two sections there are three layers and then one or as in Fig. 3 with three sections five layers, and so on; in general. with 72. sections there are 2 layers. This is effected by staggering the sections and causing alternately one layer to rise toward the right, the next toward the left. If an equal insulation value is to be securedin the first named construction, a five-fold subdivision of the layers. in question must be made so as to obtain five layers'of insulation as a maximum. This would obviously considerably increase the diificulty of manufacture. As stated, the. advantage of the present invention resides in the fact that with an equal number of transverse subdivisions at the place which is to be protected there is greater insulation value, or with the same insulation value there are fewer sectlons than in the known method of construction.

Having now particularly described and ascertained the nature of my said invent-ion and in what manner the same is to be performed, I declare that what I claim is:

1. In a winding for electrical tppara-tus, a. plurality of layers of wire, a glurality of fiat insulating strips separating adjacent layers, and other insulating strips each comprising two flat portions connected by an upstanding portion, each of said layers being subdivided into sections by said upstanding portions, and adjacent layers being further separated at the places of higher potential difference by said flat portions.

2. In a winding for electrical apparatus, a plurality of layers of wire, a plurality of flat insulating strips separating said layers.

and other insulating strips subdividing each In testimony whereof I have affixed my layer lIltOfSGCblOIIS 1111 such manner that the signature, in presence of two witnesses. sections 0 any one ayer pro ressivel rise in a direction opposite to tha t of adihcent GOTTLOB layers, whereby adjacent layers are sepa- Witnesses:

rated by more msulating strips at the places ERNST ULMER,

of higher potential difference. Mex ANsoHii'rz.

It is hereby certified that in Letters Patent No. 131L791, granted Deoember l2,

1911, upon the application of Gottlob Honold, of Stuttgart; Germany, for an in the printed specification requiring correction as follows: Page 1, line 71, for the symbol 2 read Qn-l; and that the said Letters Patent should be read with this correction therein that the same may conform to the record of the case in the Patent Ofiice. 4

Signed and sealed this 16th day of January, A. D., 1912.

[SEAL] I o. o. BILLINGS,

Correction in Letters Patent No. 1

improvement in Insulation of windings in Electrical Apparatus, an error appears Acting Conwmfssioner OfPatents; 

